Hydraulic cement.



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jlINITED STATES PATENT OFFICE.

EEEnEmcK w. BROWN, ELoEENcE, AND GEORGE w. BARTHOLOMEW, 0E DENVER, COLORADO o HYDRAULIC CEMENT.

No Drawing.

To all whom it may concern:

Be it known that we, FREDERICK W. BROWN, of Florence, and GEORGE W. BAR- THOLOMEW, of Denver, in the counties of Fremont and Denver and State of Colorado,

have invented certain new and useful Improvements in Hydraulic Cement; and We do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This inventionrelates to a new and improved hydraulic cement and the process of producing hydraulic cement from a mixture of suitable highly basic iron slag, sulfate of lime, Portland cement and chlorate of calcium.

Hydraulic cement is usually manufactured by mixing clay and carbonate of lime in such proportions that after calcination the resulting compound will contain about fifty to sixty-four parts of lime, twentytwo to twenty-eight parts silica, six to ten parts alumina andthree to five parts iron with minute parts of soda, potash and sulfuric acid.

The object of this invention is to reduce the'cost and improve the quality of the cement by making same of highly basic iron slag, sulfate of lime, Portland cement and chlorate of calcium. The economy comes from 'the use of the slag, a by-product of the iron furnace, and the improved quality 35 is brought about by the peculiar chemical Patented Mar. 12, 1912.

combination produced from the mixture and treatment proposed.

The method is to mix and grind hi hl basic molten sla or slag that has Been Win .water airuor other- 49 wise with two and one-half to twenty per cent. of sulfate of lime two to fifty per 7 cent. of or an cemen and one to ten per cent. 0 c1 ora e 0 ca clum.

Having u y escr1 e our invention what we claim as new and desire to secure by Letters-Patent, is 2- l. A composition of matter resulting from the mixture of slag, cement, chlorate of calcium" and-strlfate of li'rrfe"*"1n the pibpor- 50 tions substantially as specified.

2. A composition of matter resulting from the mixture of chilled furnace slag, hydraulic cement, chlorate of calcium and sulfate of lime, in the proportions substantially as specified.

In testimony whereof, we have signed this specificationin the presence of two subscribing witnesses.

FREDERICK W. BROWN. GEORGE W. BARTHOLOMEW.

Witnesses as to the signature of Frederick W. Brown:

J. W. HoLMEs, EDNA A. FOSTER. Witnesses as to the signature of George W. Bartholomew:

GAIL B. HAMER, WILBUR NEWTON.

Copies of this patent may be obtained for-cents each, by addressing the Commissioner of Patents, Washington, D. C. 

